Annual Return: S&P 500 Total Return Vs. BTC?
Short Answer
The model assigns meaningfully higher odds than the market for the S&P 500 Total Return Index to have the higher annual return in 2026. The model sees potential mispricing for the S&P 500 Total Return Index at 89.6% model vs 75.0% market, suggesting that strong AI-related growth and institutional conviction are not fully reflected in the market.
1. Executive Verdict
- S&P 500 total return is 9.27% as of May 21, 2026.
- AI-related growth consistently drives S&P 500 to new all-time highs.
- Bitcoin declined 11-12% year-to-date as of late May 2026.
- Spot Bitcoin ETFs show fragility and sustained outflows as of May 2026.
- Macroeconomic events and regulation in H2 2026 may reverse Bitcoin underperformance.
- AI/tech sector correction may significantly pressure S&P 500's annual performance.
Who Wins and Why
| Outcome | Market | Model | Why |
|---|---|---|---|
| S&P 500 Total Return Index | 75.0% | 89.6% | Research does not highlight strong supporting evidence. |
| BTC | 14.0% | 10.4% | Bitcoin experienced a decline and underperformance, characterized by net outflows from spot ETFs and decelerating institutional interest. |
Current Context
The S&P 500 has notably surpassed Bitcoin in performance during the initial months of 2026. As of May 21, 2026, the S&P 500 recorded a total return of 9.27% for the year [^]. Throughout the first five months of the year, this index consistently achieved new all-time highs, largely propelled by growth in artificial intelligence (AI) related sectors [^][^][^]. In stark contrast, Bitcoin (BTC) has experienced a significant downturn in 2026, with reports indicating a year-to-date decline of approximately 11% to 12% as of late May [^][^]. Bitcoin's substantial underperformance is further characterized by net outflows from spot exchange-traded funds (ETFs) and a noticeable shift in investor sentiment away from the cryptocurrency toward traditional technology and metal assets [^][^][^].
This market divergence is largely attributed to the differing roles these assets play. Bitcoin is primarily considered a liquidity-sensitive macro asset, while the S&P 500 benefits from relative stability and momentum driven by corporate earnings [^][^]. Expert opinions on the future outlook remain split; for instance, analyst Michael Saylor maintains a long-term bullish thesis for Bitcoin, predicting it will eventually outperform the S&P 500 [^]. However, current market conditions highlight a widening valuation gap, presenting Bitcoin as undervalued when compared to tech-heavy indices such as the Nasdaq-100 [^].
2. Market Behavior & Price Dynamics
Historical Price (Probability)
Outcome probability
Date
This prediction market has experienced a strong and rapid upward trend, with the probability of the S&P 500 outperforming Bitcoin rising from a starting point of 35.0% to a current price of 75.0%. The most significant price action occurred in a concentrated period, beginning with a 17.0 percentage point spike on May 19, followed by another 9.0 point jump on May 20. The largest single movement was a 16.0 percentage point spike on May 22, which appears to have been driven by reports of the S&P 500's strong year-to-date total return of 9.27% compared to a significant decline for Bitcoin. Following this peak, the market saw a notable 9.0 percentage point drop on May 25, for which the provided context does not identify a clear driver.
The chart suggests a rapid shift in market sentiment, moving from uncertainty to a strong conviction that the S&P 500 will finish the year ahead of Bitcoin. The initial base for the market was established at the 35.0% level before the series of sharp increases. After reaching a peak near 84.0%, the price has pulled back and appears to be establishing a new level of consolidation around 75.0%, which could be interpreted as a potential support level. The previous price points around 52.0% and 61.0% acted as temporary plateaus during the rapid ascent.
While the total volume of 4,942 contracts traded indicates significant overall interest in the market, the provided daily data shows no volume on key dates, suggesting that trading may be intermittent. The sharp price movements without corresponding volume data make it difficult to fully assess the conviction behind each move. However, the overall price action clearly reflects traders reacting to real-world financial data showing the S&P 500, buoyed by AI sector growth, significantly outpacing Bitcoin's performance in the first several months of 2026.
3. Significant Price Movements
Notable price changes detected in the chart, along with research into what caused each movement.
Outcome: BTC
📉 May 27, 2026: 15.0pp drop
Price decreased from 29.0% to 14.0%
What happened: The primary driver for the 15.0 percentage point drop in the "BTC" outcome was significant selling pressure in Bitcoin-related financial products. This included a reported $1.3 billion sale of the BlackRock Bitcoin ETF (IBIT) on a dark pool, coupled with over $2 billion in net outflows from U.S. spot Bitcoin ETFs across eight consecutive days since May 14 [^][^]. As of late May 2026, Bitcoin had declined approximately 13.04% year-to-date, while the S&P 500 total return was approximately 9.86% [^][^][^][^]. Social media activity was not a primary driver, as the provided information does not mention any relevant posts or viral narratives.
📈 May 25, 2026: 14.0pp spike
Price increased from 15.0% to 29.0%
What happened: Based on the provided web research, there is no identifiable primary driver for a 14.0 percentage point spike in the prediction market for "BTC" outperforming the S&P 500 on May 25, 2026. Bitcoin itself experienced only a modest 1.1%-1.2% daily gain on May 25, 2026, driven by easing U.S.-Iran geopolitical tensions [^][^][^]. Furthermore, Bitcoin's year-to-date return for 2026 was approximately -11.97% and it was generally underperforming the S&P 500 [^][^][^]. The provided sources offer no information regarding social media activity, specific news announcements, or market structure factors that would lead to such a significant shift in a prediction market favoring BTC's annual outperformance.
📉 May 23, 2026: 8.0pp drop
Price decreased from 23.0% to 15.0%
What happened: The primary driver for the 8.0 percentage point drop in the "BTC" outcome was a significant downturn in Bitcoin's price, fueled by escalating geopolitical tensions and broader macroeconomic concerns [^][^][^]. President Trump's social media posts regarding Iran tensions directly "further contributed to market uncertainty" [^], amplifying the impact of these geopolitical developments and coinciding with substantial Spot Bitcoin ETF outflows of $1.26 billion leading up to May 23 [^][^]. This confluence of factors, including triggered leveraged long liquidations, drove investors away from risky assets like Bitcoin [^][^]. Therefore, social media was a contributing accelerant, intensifying existing market fears rather than initiating the primary downturn.
Outcome: S&P 500 Total Return Index
📈 May 22, 2026: 16.0pp spike
Price increased from 61.0% to 77.0%
What happened: The 16.0 percentage point spike in the "S&P 500 Total Return Index" outcome on May 22, 2026, was primarily driven by the S&P 500's strong reported annual performance relative to Bitcoin's significant underperformance. As of May 22, 2026, the S&P 500 Price Return showed a 1-year return of 27.93% and was up 9.2% year-to-date [^][^][^]. This contrasted sharply with Bitcoin's weak performance, which was down 11% year-to-date and nearly 30% over the past 12 months as of May 27, 2026 [^]. No social media activity relevant to this price movement was found in the provided research, indicating it was irrelevant as a driver.
📈 May 20, 2026: 9.0pp spike
Price increased from 52.0% to 61.0%
What happened: The provided web research does not identify a clear primary driver for the 9.0 percentage point spike in the prediction market for the "S&P 500 Total Return Index" on May 20, 2026. The S&P 500 Total Return Index itself experienced only a modest daily gain of approximately 1.1% on that date, which is significantly smaller than the reported prediction market movement [^][^][^][^]. No evidence of impactful social media activity from key figures, major news announcements, or specific market structure factors that would explain such a substantial re-evaluation of the S&P 500's annual performance against Bitcoin is present in the available sources. Based on the information provided, social media and traditional news appear to be irrelevant in explaining this specific magnitude of prediction market price movement.
4. Market Data
Contract Snapshot
The market resolves to YES if the S&P 500 Total Return Index performs above BTC for the week of 2026 by 0.001% (rounded to the nearest 3rd); otherwise, it resolves to NO as the event is mutually exclusive. The annual percentage return is calculated from each asset's official open price on January 2, 2026, and official closing price on December 31, 2026, with outcomes verified by Google Finance and CF Benchmarks. The market opens on May 19, 2026, closes on December 31, 2026, and has a projected payout on January 1, 2027.
Available Contracts
Market options and current pricing
| Outcome bucket | Yes (price) | No (price) | Last trade probability |
|---|---|---|---|
| S&P 500 Total Return Index | $0.85 | $0.25 | 75% |
| BTC | $0.45 | $0.84 | 14% |
Market Discussion
Public discussion indicates projected S&P 500 Total Returns of +25.02% for 2024 and +17.88% for 2025, contrasting with Bitcoin's projected returns of +121.05% for 2024, -6.34% for 2025, and -11.97% for 2026 as of 2026-05-25 [^][^][^]. While other prediction markets compare Bitcoin, Gold, and the S&P 500 for 2026, they may not apply total return measures, with Gold currently showing a higher implied probability than Bitcoin [^][^]. Analysts suggest that Bitcoin's drawdown behavior often correlates with the S&P 500, but note a current divergence where BTC lags equities near record highs, potentially due to shifts in liquidity and risk appetite [^][^].
5. How do the primary performance drivers for the S&P 500 and Bitcoin contrast in the 2026 market environment?
| S&P 500 YTD Gain | 9.2% (May 2026) [^][^] |
|---|---|
| S&P 500 Primary Driver | Fundamental earnings growth from AI investment (May 2026) [^][^] |
| Bitcoin Performance Drivers | Institutional adoption, liquidity, macroeconomic sensitivity (2026) [^][^][^][^] |
S&P 500 performance driven by strong earnings and AI investment. As of May 2026, the S&P 500's year-to-date gain stands at 9.2%, primarily fueled by fundamental earnings growth, particularly from investments in AI infrastructure [^][^]. Despite various headwinds, the underlying fundamentals of the market remain strong, with the index currently making new highs [^][^]. However, prediction markets in April 2026 reflected uncertainty regarding potential S&P 500 multiple compression due to interest rate volatility [^].
Bitcoin performance heavily influenced by institutional adoption and liquidity. Bitcoin's 2026 performance is primarily shaped by institutional adoption, including ETFs and corporate treasuries, alongside liquidity conditions dictated by Federal Reserve policy [^][^][^][^]. It also exhibits high sensitivity to broader macroeconomic factors and geopolitical events, frequently acting as a high-beta proxy for overall risk sentiment [^].
Prediction markets reflect contrasting outlooks for S&P 500 and Bitcoin. In April 2026, prediction markets indicated a preference for Gold over Bitcoin, signaling uncertainty about Bitcoin's recovery momentum [^]. Historically, Bitcoin often finds its cycle bottom only after the S&P 500 experiences a final retrace; some analysts in May 2026 suggest Bitcoin has yet to finalize its bottom, especially as the S&P 500 continues to reach new highs [^].
6. What potential macroeconomic or regulatory events in the second half of 2026 could trigger a reversal in Bitcoin's underperformance against the S&P 500?
| Potential Outperformance Period | Second half of 2026 [^][^][^] |
|---|---|
| Traditional Asset Constraint | Higher input costs and tighter monetary policies [^][^][^][^][^][^][^][^][^][^] |
| Regulatory Outcome | Reduced regulatory arbitrage [^][^][^][^] |
Bitcoin is projected to outperform the S&P 500 in late 2026. This anticipated performance is driven by specific macroeconomic conditions and significant regulatory shifts [^][^][^]. During this period, traditional assets like equities are expected to encounter headwinds from factors such as higher input costs and tighter monetary policies [^][^][^][^][^][^][^][^][^][^]. Concurrently, regulatory advancements are forecasted to cultivate a more integrated global digital asset market, thereby enhancing Bitcoin's overall appeal [^][^][^][^][^][^][^][^][^][^].
Institutional investors may shift capital toward Bitcoin during this period. The evolving market environment suggests that these investors could increase their allocations to Bitcoin, potentially reallocating capital from traditional equities [^][^][^][^][^][^]. Bitcoin is also exhibiting early signs in 2026 of decoupling from tech stocks during periods of market stress, positioning it as a sophisticated hedge against monetary policy shifts [^][^][^][^][^][^]. Its inherent characteristics as a scarce, non-yielding asset may also attract capital that might otherwise be directed into equities, making it more appealing than fixed-income assets [^][^][^][^].
Significant regulatory developments will further boost Bitcoin's institutional adoption. Key advancements are crucial for accelerating Bitcoin's embrace among institutional investors and within traditional finance [^][^][^][^][^][^][^][^][^][^]. These anticipated developments are set to reduce regulatory arbitrage, fostering a more stable and integrated global digital asset market which, in turn, is expected to lead to increased capital inflows [^][^][^][^]. The combination of this sustained institutional demand and the reduced new supply following the 2024 Bitcoin halving is likely to exert upward pressure on Bitcoin's price, ultimately enabling its projected outperformance against traditional equity markets [^][^][^][^][^][^][^][^][^][^].
7. What do institutional fund flow trends for S&P 500 index funds versus spot Bitcoin ETFs throughout 2026 reveal about professional investor conviction?
| S&P 500 Index Fund Net Inflow | $44.68 billion (March 2026) [^] |
|---|---|
| Spot Bitcoin ETF YTD Inflows | Approximately $536 million (as of May 2026) [^][^] |
| S&P 500 Best Performance Probability | Approximately 32.5% (as of March 2026) [^][^][^] |
Institutional fund flow trends throughout 2026 reveal a robust preference for S&P 500 index funds over spot Bitcoin ETFs. S&P 500 index funds have demonstrated consistent demand, with data from March 2026 reporting a net inflow of $44.68 billion for equity index funds, reflecting strong professional and retail preference for traditional equity vehicles [^]. In stark contrast, as of May 2026, spot Bitcoin ETFs have experienced significant deceleration and fragility, with year-to-date inflows at approximately $536 million. This marks a sharp decrease from previous years, and recent sustained outflows threaten to turn 2026 net negative for these products [^][^].
This divergence reflects differing professional investor conviction regarding asset roles. Bitcoin is increasingly perceived as a secondary, liquidity-sensitive tactical asset, separate from the structural, core allocation role occupied by S&P 500 index funds [^][^]. Prediction markets further illustrate this sentiment, with implied probabilities as of March 2026 showing S&P 500 best performance at approximately 32.5%, compared to approximately 27% for Bitcoin best performance [^][^][^].
8. How do the risk-adjusted returns (Sharpe ratio) of the S&P 500 and Bitcoin compare on a year-to-date basis in 2026?
| S&P 500 Sharpe Ratio | around 1.1 (early May 2026) [^] |
|---|---|
| Bitcoin Sharpe Ratio (late April 2026) | approximately +20.35 (late April 2026) [^][^] |
| S&P 500 YTD Gains | roughly 4.5% (through late April 2026) [^] |
The S&P 500 demonstrated improved risk-adjusted performance and positive year-to-date gains. As of early May 2026, the S&P 500 recorded a Sharpe ratio of approximately 1.1 [^]. The index successfully recovered from early-year volatility, reaching record highs by late April 2026 [^][^]. Through late April 2026, the S&P 500 also showed positive year-to-date gains of roughly 4.5% [^].
Bitcoin's Sharpe ratio experienced significant volatility, eventually showing a strong rebound. Early in 2026, Bitcoin's Sharpe ratio dropped to around -43 during a period of market stress [^]. However, it rebounded significantly to approximately +20.35 by late April 2026 [^][^]. Despite this recovery in its Sharpe ratio, Bitcoin remained down approximately 15% from its January 1st level on a year-to-date basis through late April 2026. This indicates that the S&P 500 outperformed Bitcoin in overall gains during this period [^].
9. How might a significant correction in the AI/tech sector during Q3-Q4 2026 affect the S&P 500's annual return relative to Bitcoin's?
| S&P 500 IT Sector Weight | 35.00% (April 2026) [^][^] |
|---|---|
| Bitcoin-S&P 500 Correlation | 0.7726 (2020-2023) [^][^] |
| Bitcoin vs S&P 500 12-Month Performance | Bitcoin -30.35%, S&P 500 +26.98% (12 months to May 2026) [^][^] |
A significant correction in the AI/tech sector would heavily impact the S&P 500. A notable correction in the AI/tech sector during Q3-Q4 2026 is anticipated to exert considerable downward pressure on the S&P 500's annual performance. This vulnerability stems from the Information Technology sector's dominant weighting, which accounted for approximately 35.00% of the S&P 500 as of April 2026, and its outsized contribution to the index's overall returns [^][^][^][^][^].
Bitcoin's increasing correlation suggests synchronized market movements. Bitcoin has demonstrated an elevated correlation with the S&P 500, with a 0.7726 correlation observed from 2020 to 2023, and its 30-day correlation frequently surpassed 70% over the past five years [^][^]. The increased institutional adoption and approval of Bitcoin ETFs in 2024 have further integrated the cryptocurrency into traditional financial markets, making it more susceptible to macroeconomic factors and equity market movements [^][^]. Consequently, Bitcoin may experience synchronized downward pressure in the event of a tech-led S&P 500 correction [^].
Bitcoin's recent underperformance makes it vulnerable to a tech downturn. While Bitcoin typically exhibits higher volatility, it underperformed the S&P 500 in the 12 months leading up to May 2026, declining 30.35% compared to the S&P 500's 26.98% gain [^][^]. As of May 2026, Bitcoin and other cryptocurrencies have shown a tendency to consolidate lower, even as stock markets have continued their year-to-date rallies [^]. Given these integrated movements, a significant correction in the S&P 500 driven by the tech sector would likely lead to Bitcoin experiencing comparable downward pressure, potentially affecting its annual return relative to the S&P 500 in 2026 [^].
10. What Could Change the Odds
Key Catalysts
From 2016 to 2025, Bitcoin significantly outperformed the S&P 500, with a cumulative return of +20050.4% compared to the S&P 500's +300.5%. Bitcoin won 7 out of 10 calendar years in this period [^]. The Polymarket event "Bitcoin vs. Gold vs. S&P 500 in 2026" is scheduled to resolve on or around Dec 31, 2026, which means the full-year comparison will be judged by the end-of-year outcome [^].
For the S&P 500, J.P. Morgan's 2026 market outlook indicates that an AI "supercycle" is expected to drive above-trend earnings growth of 13–15% for at least the next two years, supporting a constructive view on US equities [^]. Bitcoin, however, faces a specific near-term test around late April 2026, with a 'Fed first, GDP and PCE right after' sequence [^]. This 48-hour period, involving a Fed decision followed by Q1 GDP and March PCE data, could be bullish for Bitcoin if the Fed is dovish and inflation/data are cooler, but bearish if data is hot or strong [^]. Consensus for Q1 GDP is 1.8% annualized growth, and core PCE expectations are around 0.24%–0.28% month-over-month (approximately 3.1% YoY in the stronger reading) [^]. A higher print for these figures would reinforce a hawkish path and could dampen rate-cut pricing [^].
Additional catalysts include the Memorial Day holiday (May 25, 2026), which creates a CME liquidity 'price discovery gap' as trading halts at 12:00 pm CT and reopens at 5:00 pm CT, potentially increasing sensitivity to headlines [^] . Furthermore, uncertainty around a new Fed chair's first FOMC meeting (late May or June 2026) is expected to be a trigger, potentially increasing short-term Bitcoin volatility depending on hawkishness versus inflation tolerance [^].
Key Dates & Catalysts
- Strike Date: January 01, 2027
- Expiration: January 01, 2027
- Closes: January 01, 2027
11. Decision-Flipping Events
- Trigger: From 2016 to 2025, Bitcoin significantly outperformed the S&P 500, with a cumulative return of +20050.4% compared to the S&P 500's +300.5%.
- Trigger: Bitcoin won 7 out of 10 calendar years in this period [^] .
- Trigger: The Polymarket event "Bitcoin vs.
- Trigger: Gold vs.
13. Historical Resolutions
No historical resolution data available for this series.
Get Real-Time Research Updates
Sign up for early access to live reports, historical data, and AI-powered market insights delivered to your inbox.
